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--></style></head><body lang="EN-US" link="blue" vlink="purple" style><div class="WordSection1"><p class="MsoNormal">I am working to align an energy model with an existing 7-story office building. The building has two air handlers, one serves the exterior of the building and one serves the interior. Both are constant volume units and treat their associated portion of the building as a single zone. Very odd system, but very old building.</p><p class="MsoNormal"> </p><p class="MsoNormal">I had both units as single zone systems but was having a difficult time aligning the gas usage for the exterior AHU. Turns out the AHU has a hot deck and a cold deck and mixes down to serve the whole building, and controls are very limited, requiring the heating deck to always maintain 110 <span class="SpellE">degF</span> if the exterior is calling for heating. This 110 <span class="SpellE">degF</span> is mixed down with the cold deck to 85-90, essentially wasting the gas it took to get it up to 110… a very easy ECM. So I switched the system type to dual duct and my gas usage started aligning perfectly, with the exception of March. </p><p class="MsoNormal"> </p><p class="MsoNormal">My schedules are all Jan-Dec since it’s an office building, I haven’t manipulated the default weather file for Kansas City, Missouri, and my only other gas load is domestic hot water which has the ‘Available 100%’ schedule. So I’m at a loss as to why my March gas usage is so high, pretty much equal with January usage, which is twice what the building is actually using in March. The gas consumption curve which bottoms out in the summer and peaks in the winter looks like every other curve I’ve seen with the exception of March.</p><p class="MsoNormal"> </p><p class="MsoNormal">I’ve poured through my inputs and the output reports and can’t find anything. Has anyone ever experienced this, or know the dumb input I probably screwed up?</p><p class="MsoNormal"> </p><p class="MsoNormal">Thanks!</p><p class="MsoNormal"> </p><p class="MsoNormal"><span style><img width="189" height="63" id="Picture_x0020_1" src="cid:image001.png@01D00412.7BB1B2B0" alt="cid:image003.png@01CDAB78.6524ACE0"></span></p><p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;font-family:"Century Schoolbook","serif";color:black">Ben Hollon</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222"></span></p><p class="MsoNormal"> </p></div></body></html>
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